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    <script>
        /* 
        使用function*可以声明一个generator状态机对象,yield关键字用来定义一个个状态
        调用generator函数后会返回一个iterator对象,每次调用iterator对象身上的next方法,可以执行下一个yield后的状态
        */
        function* generator(){
            yield console.log(1);
            yield console.log(2);
            yield console.log(3);
            yield console.log(4);
            yield console.log(5);
        }
        const gen=generator()
        console.log(gen);
        gen.next();
        gen.next();
    </script>
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